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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec35600e4131f9ad4a139d560809fcc518fcedb9150ae4f95d80e7e8b398b8e1' 
  AND token = 'rbs50j4BXENu1NtU2aMHLL0LwqJSFpZ7CLxHFqH9L8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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