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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1efe18f73526b434fe6ed8ec3a0e23c150838e94d8a89799dc261e5a0faa9b1b' 
  AND token = '2aXNCfVnLBaItzDTKBjI5be+JtmbzivLUQNXIp6WLuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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