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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc3b261c04adf39f949b005c398aeb98f0fde1c7b0c22430108695fe6d8cce5' 
  AND token = 'mL8KhjouuRWIRe7nMdfiPLDVc1hNxgCkQg1pF0mYwew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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