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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8fdcdd99190f05814f43e702a0ea8bc817d1427283287a48ad32951085a0b6d' 
  AND token = '4qbwkyHJytqDMoYbFWdgsnYnbRHdVGJ7U4nEb+l8v0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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