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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6c0f9fd5db3d71f5783b5464698581f6f873fd264d0bc3a99c138e45dd2491' 
  AND token = 'r+p7oAZ/FGldTlHFBtOwB08IdzXe0C7bMJzDh9r0k20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}