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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710566676639c6e06bcf2261d757a184166ee3959d6d50b8c89c8940c5b97b23' 
  AND token = 'a8al/e2P+etTxPunATud2zQYd/Kg6wgSaYIglEX9NlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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