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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c20f84255c2db33438e978bc2d670b46d61be8901e106b782b1e7b166e8ba5' 
  AND token = '1zXfl2GsTpMrk/5obYV/Vtx6e6or+bkl7VOeq3N6skA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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