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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e96e3200559686a5a717a22a41f38c99650e6d86acf370d90f9a2dd9f123646' 
  AND token = 'wV5hQtW3U0tOB5KZ8tnECWDEiCClsnkNw2p40fQ0tNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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