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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17317ae663d895e15b8c5e7c6d62b6cb3caafae1274b387e8b1126729020c4f4' 
  AND token = 'pZz0JujzrHmmsIOYUXsW19PybBp5Ha2UHcmJg/n0ejw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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