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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60da7260b63a6530bd62cc1548e26d28db4da016b2723c77abce4556664d082d' 
  AND token = 'f3b+Rtt57iqcBbAtkkwb9JNeM/JDSM4zbz1upLidA9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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