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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a6d5d8e35208bb9b2dd55f10e0d6578b00b20c1a9b2e40638efb0fb784b1c4' 
  AND token = 'dVS47LivbZLIRbkNoFiuh6xvPxcgQ+vZaZYbUydrIkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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