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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4059cf0498e025baa2fed308fa78008c82cfdd5ea739dd7533f7acffa810c5' 
  AND token = 's3C02yZl49seegswhmtLQNXHkSaLoLmwNjCiMX7kUs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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