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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '165645064cba80f407424891453262893c5c052a0ea462f35828e88c0e8e2fe0' 
  AND token = '7kr7AEGdbwTMAlVhMNUR6oq+04QjgS0BIBr8mbpsJ/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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