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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace68ec8c0abd08e295471ecc7a343d80e8b4450d0f6c7ded53158ca8a2f7d7b' 
  AND token = 'rnooiZrJdxomSKQRtz1Fp3K5C0XK/kkTi3nHQL9d0VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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