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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ebe8ecb7713e47da066052d2487edfddb918c680b866c87aec88bf341223bb3' 
  AND token = 'w+fZ/pI145ohs4ot5mZTab/ZQh0Zl1Ww7c1/MKwadgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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