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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c670d77f10f793c8ac40986ca940800a567db2f35a3afb6811630533ab607bbd' 
  AND token = '85jQlAYpOp+s5Tf9/MTD4aAclma0Rwpw9+Py4QUL7WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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