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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0905db28f6be40ede72e61bf297eace6f93883f90c51afac7b1ebb0173fb2b' 
  AND token = 'cL7o5aaLQa1UX4jJWqZ6Qn1dXR7cehia2bnqO80n/9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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