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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36fe4c9c6c71bb1ef4be2d4327f264af9e597e52da948380e4e87e9ee9066232' 
  AND token = 'WDH8tcrOjQFHCNfnpl6zM8Gyxbsy9Rn5ieCaYEdWGgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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