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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ea37a1982b339a20c738283670b8d4b2ccf2379fcc261fbe25b660bb5759ef' 
  AND token = 'Zf2jR+dS23TzaJaUOgsHZ52ZnygtZCiIqSklqSnEWoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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