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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce591626fadd3f13057b5b6dff34285834f6fddcd4c5778e43c3c1398cd1a3d' 
  AND token = 'SXlMEccY5Tr7niTncTbo6Sh5gV4jLefUbodoVNbVUn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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