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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94c1d7c8b735f535ae215ed202768fb21abc789d388a1431c11a61a49a4e21e' 
  AND token = 'DctU1usCqubP/rwv8joTmng3uhwvAkYtedsYPf7w5rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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