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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ca82d652001babdee355b2b0ab0d645e1189d6ef39675b80b858a9e1dfb391' 
  AND token = '90V4KTyliYYg+zjXBf5LigZq4GBDsNsUhiy5qY5lagk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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