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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda94b2ed520f9c4702ffa956708058862a0aa05ef9c31b7448f7d099f6b2a0e' 
  AND token = 'X2QhOF6tLg/ie3SLgLXyW/CeIYH98FWj3sZKPi8sp/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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