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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732f2d7059ca5eb67afec886fc5176fb4b45347e3eecc5d6174c1173b53c2ad9' 
  AND token = 'Fz9FZ+EL3YnC4oWU/jNSoBSoigy0JTqfflESr68jsA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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