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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7a46311212c6ae24bd20b4065506a03a203c5df657767db6117fbd166105c5' 
  AND token = 'fcepOSM43L6w5ynuRD4MJXc0wSStZIRnu4iC/QN6AEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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