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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdee9eb029e54af527a3366fedf28ddc44631a9bbca89e9759afcb10bacd18f0' 
  AND token = 'tvI4RUurEuYqqpehn9BoPFOp0lyGZ2aE2L7c8oik3Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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