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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9e5956dad2b51e8e9fa02844747da88f076ef1bcdd7ccfd733467775094078' 
  AND token = '3iDHcQ+9IlnldEGswUYpBfJVle0Twu7NF+83vT+nIhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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