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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e7b83fcf7ef837a9738d381239930a9da7d8cbee11bd3617b22e993ce220f3' 
  AND token = 'QNns5zfGmZzs6cxY6VXcp2n0RPHdBNDTZ1F1swVhJmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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