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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974b26ba55324021cd907a9ffc1b74c77ec9b6ae0ba102050642b5e16f15deeb' 
  AND token = 'h2TCRhtvDZf/fUTvcaknnuzWsa0fPEWSpu7YTHhMlho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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