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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a035636d2a977174cb17cbbfbf2f6db7a33f805cde9fabc4146f90e3471f801' 
  AND token = 'sla2NpS0wjAsoHVaCNN5uEXRahsESILbcVv0pPqLYig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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