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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4559f420aecf6ffd5123615c9918709673a57e913dd8328771f5d1d50141806c' 
  AND token = 'GJ/843S4xHXRocP6T6ylUOsfTTuQ3uYPuzHvAKPkV9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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