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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dcc133ceff9422a6ff691218679f834113e6a33e2657863eb59011ecffeb292' 
  AND token = 'm/bv7wptIefXcC8VlYo8gOaJFmk+dPqkQ1UC/sf/PP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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