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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198ecfaac4db99f5cd50c8d606d22637285491c971c5af3e12ac0091f3cf8841' 
  AND token = '0QWaVv9P75QV50Hz/nzZv6PDZwdzlrjBeagwimrsEHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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