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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d25b5ff1d633bd500f3a326e55e395f9a7933d0a51c1cb74ac26b2f1007552' 
  AND token = 'Ys8Jk22oNI8AunEW5PUY1tqLrDtl+S3n7L9Q2eqJfP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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