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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0b70affcbe0a6477ff67fc1b21d9308641c58f340befaa163cb637a4e5bd33' 
  AND token = '5rqrDN6OVfJ6NJ+57NVg6EE9JgRg92KGW5Qu5UsnX2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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