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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43d451a1ec79c8cf1d536a1622af38beda887c7e5142e970b9909048a540ffad' 
  AND token = 'HC6MdEUcCbyJ95IWaudRMCY040sKTNFOP+z66pebWLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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