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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1ab6e65fd258c550bbecfabc74b6ff4e3d9ce245c1f1a126d4ade1e2cf5874' 
  AND token = 's/3arSKDNkD9+5yO0IU1VBy0lA7ddi6iH/DBcH5mLUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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