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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18552c08009bc7ef0d49a99745d96c8148f13e6520c6f312c1c4efad39f9ebe' 
  AND token = 'sAjifX2AuCgA4PV4a2aJtfuIHFpXI00cKU1xrwsLulk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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