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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '838f6d00888b7d06e3e002f1e5ecd9b8b60fc688ac19b69fb052a4506ddd329e' 
  AND token = 'GJ7mBoLatozEBYR1O0ZAtK0KgQN1jYcDbBSzmisdTLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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