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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ee6d951bf81ef0f582a8969088da7265ce4833b8570ddb1f806df8ad877eb9' 
  AND token = 'baGYQ6q8Bol4tGFGYv8x/nl7Xc0P0M8B0ASUnvFReQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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