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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f32d21885ccd070cde8f57596c3414e2a0c4e05e5e608dc91e3a737aa5b2f7a' 
  AND token = 'N2FGyK5Z5vDAFcNwHGja3oEbgPxxsoJc3ahVKXWORzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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