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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbd150c0b8304826801273cb992654cc878218669dcdfe74340f88f1be7d263' 
  AND token = 'dZfq7x18vNTSEiqaPGT/+TY4TnG3Lp0Rnoq5NT7VCXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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