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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fe965ed1894980284a7de9409fe7fa0edb3e7da908e57d916f8ddf0833e326' 
  AND token = 'Y8uXA+DQDLW9Mn1IHVitymRRJ2a00hxP/3Evm317A9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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