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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4692e53bd8ea1d7ccbcb1379395ba19dfad2d1d978f10a75b4d821c0c20cd6f' 
  AND token = 'FGumUjsKxewpN5PWnytcHnptGA924+jwYt6WW59zpXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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