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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece3d9aebdff53fc8929271b3e0501582e06a17f0c48e90bfbd79253bca6abae' 
  AND token = 'ozWD5N3mkACN1MDPE7ONdy1IMfhD+YBuZkJkMskSHIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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