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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ed589c1d6de270f378f357812bf911e15364972f50de9b7dc3530a91fb47b6' 
  AND token = '8htI/Nbr0a0Lrk0moAFPAENbE/hZh0WPRRF9b50AKP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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