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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c5e9a19bc95b496ad999b748d0f7b8e9c282085886b262e2e353f0a33ea30a' 
  AND token = 'XjeW2D6QWY4FmlMCnXzQ+y8nxaU1N0QtKBKqj1ozMXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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