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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'accd9cb2373395b31c75ce58026bf258134126124ac633b3e3d2c04b62625d15' 
  AND token = '24c6O4KfK6U17iIY235ekzwp1bqG0TxszrlonubcH68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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