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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fbb0fab9fd861a08644f25d1e439b234fd163a1b12b0ed809e3cf5884bec2c8' 
  AND token = 'euNXqsL7eCSxMEJXFO9hxfUNb2ILiWF77j8LXS8oY98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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