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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a825d6eb6898f236516396322223df1b097a4fc3e2cc27373a64be3154f065' 
  AND token = '9/073g5JnOtnHdcJU82Do3yT9V7y6j6WFqmTkzf28EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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