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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39ab9322d32fb36500ce09f4ca2ed4e93df009cc9858fdc17ec1e367a4371d3' 
  AND token = 'HKW2Ir+mZ3DZwFBCbVxVWuSj+JmeARNAh2i6pmbIkL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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