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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a6c1396f7e595f18a62fad234387170925c5d384ba16c3ddcc65260683abb8' 
  AND token = 'CHQcJaxHscab2cuGkE6VlE09Z9LO8h1QEihYF4Iw/I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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