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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eb9d32cb62436509613d01d322528488d08b385731647082eef3b0b1ec215f3' 
  AND token = 'XePDEhJk26++0kmW6G/Md9QRouSFsqF9lUGRNFmVc0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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