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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe1e40c35c8674df9feaa7a2e37ee1bc4c183a4b0cf915190464a4c611f4c74' 
  AND token = 'r9kRJtq+h/zoDcD1N+Einy/e0zVx/moZFmC7r+A7grg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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