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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5b9ee2dd4da8a169403c682b2033a473fca946319b045131b9380190853c1a' 
  AND token = 'HHh2u1WoVWntPykFNecQB/Fb/9Ly4ri6puohjChIsRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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