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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634d0983b3c75761b4bcb08658e30983f7b92d149c8c93694649c2801744eebb' 
  AND token = 'IC/4xaw3rpotxYyMV2jVexghH+WDG8l7/kPD0CdN1XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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