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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af78ae3fbb5240522e9b2f32501af105749936530ab7c66f84e2fe162e6a2fc' 
  AND token = 'zX/5ade1ZNxN1ON5ujtRHaQZmS9EDUPXTl5W3yj2phQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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