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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b354d3395b54f6b184029205ef447c0130c9593554f44438cb5081a100867c5f' 
  AND token = 'cA5tDA059ho1UO+0SoBWt+n4HFTEpcC57zX+Jx+ESOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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